Can you be more clear about how it's all powered; Is the router powered through PoE on eth0 with passthrough enabled on eth4, or do you have the router powered by the included wall wart with the AP separately powered by it's included PoE injector? The PoE watchdog feature only works in the former case, otherwise your AP is going to always be powered as long as the injector is plugged in. If you're using passthrough powering both devices with one injector you could ping the AP itself with watchdog. I have this setup on a couple of my client sites and never had an issue, the ER-X doesn't toggle the PoE on until it's initialized.
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